#3F69F1

CSS

:root {
  --secret-of-mana: #3f69f1;
  --secret-of-mana-rgb: 63 105 241;
  --secret-of-mana-oklch: oklch(0.571 0.21 266.6);
}

.element {
  color: var(--secret-of-mana);
  background-color: hsl(226 86% 60%);
  border-color: oklch(0.571 0.21 266.6);
}

Tailwind CSS v4

@theme {
  --color-secret-of-mana: #3f69f1;
  --color-secret-of-mana-50: #dcf4ff;
  --color-secret-of-mana-100: #cae6ff;
  --color-secret-of-mana-200: #afd0ff;
  --color-secret-of-mana-300: #8bb0ff;
  --color-secret-of-mana-400: #6594ff;
  --color-secret-of-mana-500: #4775ff;
  --color-secret-of-mana-600: #3c64e4;
  --color-secret-of-mana-700: #3050b7;
  --color-secret-of-mana-800: #1c3b8a;
  --color-secret-of-mana-900: #122961;
  --color-secret-of-mana-950: #051543;
}

SCSS

$secret-of-mana: #3f69f1;
$secret-of-mana-rgb: 63, 105, 241;
$secret-of-mana-light: mix(#fff, $secret-of-mana, 20%);
$secret-of-mana-dark: mix(#000, $secret-of-mana, 20%);

.element {
  color: $secret-of-mana;
  box-shadow: 0 0 0 2px rgba($secret-of-mana, 0.35);
}